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Your browser will redirect to your requested content shortly. Conditional Expressions in Python 2. In this post I will walk you through generating RSA and DSA keys using ssh-keygen.
Public key authentication for SSH sessions are far superior to any password authentication and provide much higher security. I will also explain how to maintain those keys by changing their associated comments and more importantly by changing the passphrases using this handy utility.
RSA keys have a minimum key length of 768 bits and the default length is 2048. When generating new RSA keys you should use at least 2048 bits of key length unless you really have a good reason for using a shorter and less secure key. Because DSA key length is limited to 1024, and RSA key length isn’t limited, so one can generate much stronger RSA keys than DSA keys, I prefer using RSA over DSA. Another reason for not using DSA is that DSA is a government standard and one may wonder if the key length was limited deliberately so it will be possible for government agencies to decrypt it. When the key generation is done you would be prompted to enter a filename in which the key will be saved.
You should make sure that the key can only be read by you and not by any other user for security reasons. Next you’ll be prompted to enter a passphrase. Each generated key can be protected by a passphrase. When a key is generated with a passphrase, the key can’t be used without the passphrase, so by using a passphrase one can prevent others from using his private keys without first guessing the passphrase. A good passphrase should be at least 10 characters long.
One should stay away from English sentences as their entropy level is just too low to be used as a safe passphrase. I usually use a randomly generated passphrase, as this kind is considered the most secure. If you intend to use the key for accessing a remote machine from inside an automated script you may wish to enter an empty password, so the script won’t need user interaction. If you create a passphrase-less key just make sure you only put it on trusted hosts as it may compromise the remote machine if the key falls to the wrong hands.
After printing the key information the program will terminate. Adding comments to keys can allow you to organize your keys more easily. The comments are stored in end of the public key file and can be viewed in clear text.
As you can see the comment is appended in clear text to the end of the public key file. Notice that each copy of a public key can have its own comment and you cannot retrieve the comment from the private key. Passphrases allow you to prevent unauthorized usage of your key by meaning of protecting the key itself by a password. Although your ssh directory holding the private keys should be unaccessible to other users, the root user of the system, or anyone who can achieve is privileges can access your key and copy it.
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